Oil burner device



I May 4, 1937. A. BARGEBOER 2,079,430

on. BURNER DEVICE Filed July 15, 1954 F/q:4 Adali- Bav eboer INVENTOI'E.

Patented May 4, 1937 UNITED .STATES,

PATENT OFFICE 3 Claims.

This invention relates to a liquid sprayin device in which liquid is forced by pressure through channels which are tangentially arranged to a socalled whirling space. The

5 liquid flowing tangentially into this whirling space will rapidly rotate. v

Since in a rotating =-frictionless fluid the product of velocity and radius of every particle has a constant value (r v=constant), the speed of lo rotation is increased by the spiral flow towards the centre of the whirling space, whereby the liquid will emerge in the form of a rapidly rotating liquid-jet from a central spray opening in the whirling space.

18 Centrifugal force breaks up the jet into mist consisting mostly of fine particles. The central part of the mist-cone will, however, be rich in coarser particles because the centrifugal force in the center of such a jet is insufilcient to produce 20 fine particles.

The present invention eliminates these objections by producing in the central part of the whirling space a cavity, so that the liquid emerges as a rapidly rotating film and by break a ing up this film into a very fine mist.

This is accomplished by arranging in the surface opposite the spray-opening an opening opposite the spray-opening, the diameter of which is less than of the diameter of the whirling 30 space and larger than the spray-opening, and

which is connected with a return-lead for returning a part of the liquid suppiled to the whirling space.

Furthermore, the spray-opening has a sharp 5 edge.

In the drawing Fig. 1 is a diagrammatic section of the tip of the atomizer;

Fig. 2 is a top view of element 2 of Fig. 1;

Fig. 3 is a longitudinal section of the atomizer;

4 Figs. 4 and 4A are, respectively, a longitudinal section and a top view of elements 31, 22 of Fig. 3.

Nozzle I has a spray-opening 5 having a sharp edge and has a. diameter d. The conical part l2 of nozzle l forms, together with the fiat part 4 45 of bushing 2, a whirling space 9. The channels formed by the grooves 3 of the cone-shaped part of element 2 lead tangentially into this space.

A bore 1 through bushing 2"has-an opening 5 of diameter D. The bore is opposite opening 50 5, D being larger than d and smaller than /gjof,

the diameter of 4.

The operation is as follows: the liquidflowing through the tangentially arranged channels 3 at high velocity and tangentially to the whirling" I space 9, maintains the liquid which is spirally supplied to this whirling space in a very rapid rotation. When it reaches the circumference of opening 6, part of the liquid flows always rotating through bore 1 to space 8 and flows back to a space of lower pressure i. e. through a pressure 5 regulating valve to the liquid-reservoir. v

Owing to this rotating movement and rather I sharp direction-change, the liquid forms a hollow curved surface, emerging over the edge of opening 6. There is no liquid in the center of the 10 whirling space so that when it reaches the smaller spray-opening, the liquid does not emerge as a. jet, but only as a quickly rotating film. Since there are no particles in the center where the centrifugal force is too small, this rotating conical film spreads out intoa very fine mist.

Fig. 1 shows schematically this condition. The central space is at I0 (cavity), free of liquid.

The hollow space II is formed owing to the rapid spinning of the fluid which escapes through the opening 6 and bores l and 8. This will force a rapidly rotating thin film of liquid through opening 5. The mist emerges in the form. 01" a cone ll. It is very important that the whirling space 9 debouch into the spray-opening 5 over a cone l2, or other converging surface.

Furthermore, it isof great importance that the channels 3 remain unchanged and that the spaces 8 and I 3 be separated. In many cases it 3 is preferred that the tangential channels 3 have a direction with an axial component.

The construction shown in Fig. 3 meets these requirements. Here the spray-opening 5 is arranged in plate 32, which is held by means of nut 29 centered with respect to part 361), which in turn is held centered in head (36a) by means of nut 26. The unit 29 is held in place on the assembly by means of a screw 29a passing through the head of sleeve 26. Diaphragm 22 40 (see Fig. 4) is clamped between 36a and "D. Diaphragm 22 has six holes which permit communication through two circumferential grooves in 36a and 36b between the supply-opening 20 and channel 24 and supply-chamber l3. The liquid flows from chamber l3 through the tangential grooves 3 on the conical part of the frontal surface of cylinder 31 to the whirling space which is formed by the other part of the frontal surface of cylinder 31 with plate 32. The {diaphragm 22 is held 'tightj between the shoulder of cylinder 31 and nut 28 'so that space 3 .is hermetically separated from the supply-space II. Owing'to' the flexibilityofdiaphragm .2 ndthe clearance in the central hole of the diapliragmj'li'.

around the screw holding, cylinder 31, the cen- 'tering of the cylinder 31 'on'plate 32 is not disturbed. The liquid supplied under pressure at 20, flows through 24, I3, grooves 3, to the whirling space. The part which'is' not atomized returns through bore 1, chamber 39, channel l8 and connection I'l.

By this arrangement it is possible to regulate the atomized quantity of liquid is a very simple fashion. If the pressure of the liquid returning through i is varied, then the diameter of the cavity within the spinning fluid in the whirling space will also change, and consequently the thickness of the film to be atomized emerging from the opening 5 increases with the increase in the thickness of this film. The atomized quantity of liquid will increase at increasing pressure in I and will diminish at decreasing pressure in I. On the other hand, the speed of rotation will increase at increasing pressure in the annular passage i3 in response to the adjustment of the pressure regulator, and consequentlythe' diameter of III will increase, whereby the atomized quantity of liquid diminishes. As the liquid whirls faster in 9 the hollow space I!) grows wider and the liquid film issuing from opening 5 grows thinner, whereby the quantity of atomized fluid iS diminished,

1 channels leading from the pressure chamber to the whirling chamber, said whirling chamber having a relatively small spray opening and a second relatively large opening centrally located therein opposite the spray opening, said second opening being substantially less in diameter than said whirling chamber, a third chamber, a fuel return channel connecting the second opening with the third chamber to the supply chamber.

2. A device according to claim 1 and in which the diameterof the second opening is less than three-fourths of the diameter of the whirling chamber. V

3. A device according to claim 1 and in which the tangential channels have an axial component. l

ADQLF BARGEBOER. 

